Remove (Delete) Rows from ASP.Net GridView without Database using C# and VB.Net

Hi smile,

Refer below sample.

HTML

<asp:GridView ID="gvRecord" runat="server" AutoGenerateColumns="false" Class="table table-striped table-bordered table-hover"
    OnRowDeleting="gvRecord_RowDeleting" OnSelectedIndexChanged="gvRecord_SelectedIndexChanged">
    <Columns>
        <asp:BoundField DataField="CustomerId" HeaderText="CustomerId" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
        <asp:CommandField ShowDeleteButton="True" ButtonType="Button" ControlStyle-CssClass="btn btn-danger"
            ShowSelectButton="true" />
    </Columns>
</asp:GridView>
<br />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" Class="table table-striped table-bordered table-hover">
    <Columns>
        <asp:BoundField DataField="CustomerId" HeaderText="CustomerId" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
    </Columns>
</asp:GridView>

Namespaces

C#

using System.Data;

VB.Net

Imports System.Data

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("CustomerId", typeof(int)),
                        new DataColumn("Name", typeof(string)),
                        new DataColumn("Country",typeof(string)) });
        dt.Rows.Add(1, "John Hammond", "United States");
        dt.Rows.Add(2, "Mudassar Khan", "India");
        dt.Rows.Add(3, "Suzanne Mathews", "France");
        dt.Rows.Add(4, "Robert Schidner", "Russia");
        gvRecord.DataSource = dt;
        gvRecord.DataBind();
    }
}

protected void gvRecord_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    GridViewRow row = gvRecord.Rows[e.RowIndex];
    int id = Convert.ToInt32(row.Cells[0].Text);
    int index = Convert.ToInt32(e.RowIndex);
    DataTable deleteRow = (ViewState["dt"] as DataTable).DefaultView.ToTable(true);
    DataRow[] dr = deleteRow.Select("CustomerId = " + id);
    foreach (DataRow d in dr)
    {
        deleteRow.Rows.Remove(d);
    }
    ViewState["dt"] = deleteRow;
    this.GridView1.DataSource = (ViewState["dt"] as DataTable).DefaultView.ToTable(true);
    this.GridView1.DataBind();
}

protected void gvRecord_SelectedIndexChanged(object sender, EventArgs e)
{
    GridViewRow row = gvRecord.SelectedRow;
    int id = Convert.ToInt32(row.Cells[0].Text);
    string name = row.Cells[1].Text;
    string country = row.Cells[2].Text;
    if (ViewState["dt"] == null)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("CustomerId", typeof(int)),
                        new DataColumn("Name", typeof(string)),
                        new DataColumn("Country",typeof(string)) });
        dt.Rows.Add(id, name, country);
        this.GridView1.DataSource = dt;
        this.GridView1.DataBind();
        ViewState["dt"] = dt;
    }
    else
    {
        DataTable dt1 = ViewState["dt"] as DataTable;
        dt1.Rows.Add(id, name, country);
        this.GridView1.DataSource = dt1;
        this.GridView1.DataBind();
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim dt As DataTable = New DataTable()
        dt.Columns.AddRange(New DataColumn(2) {New DataColumn("CustomerId", GetType(Integer)), New DataColumn("Name", GetType(String)), New DataColumn("Country", GetType(String))})
        dt.Rows.Add(1, "John Hammond", "United States")
        dt.Rows.Add(2, "Mudassar Khan", "India")
        dt.Rows.Add(3, "Suzanne Mathews", "France")
        dt.Rows.Add(4, "Robert Schidner", "Russia")
        gvRecord.DataSource = dt
        gvRecord.DataBind()
    End If
End Sub

Protected Sub gvRecord_RowDeleting(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)
    Dim row As GridViewRow = gvRecord.Rows(e.RowIndex)
    Dim id As Integer = Convert.ToInt32(row.Cells(0).Text)
    Dim index As Integer = Convert.ToInt32(e.RowIndex)
    Dim deleteRow As DataTable = (TryCast(ViewState("dt"), DataTable)).DefaultView.ToTable(True)
    Dim dr As DataRow() = deleteRow.[Select]("CustomerId = " & id)

    For Each d As DataRow In dr
        deleteRow.Rows.Remove(d)
    Next

    ViewState("dt") = deleteRow
    Me.GridView1.DataSource = (TryCast(ViewState("dt"), DataTable)).DefaultView.ToTable(True)
    Me.GridView1.DataBind()
End Sub

Protected Sub gvRecord_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim row As GridViewRow = gvRecord.SelectedRow
    Dim id As Integer = Convert.ToInt32(row.Cells(0).Text)
    Dim name As String = row.Cells(1).Text
    Dim country As String = row.Cells(2).Text

    If ViewState("dt") Is Nothing Then
        Dim dt As DataTable = New DataTable()
        dt.Columns.AddRange(New DataColumn(2) {New DataColumn("CustomerId", GetType(Integer)), New DataColumn("Name", GetType(String)), New DataColumn("Country", GetType(String))})
        dt.Rows.Add(id, name, country)
        Me.GridView1.DataSource = dt
        Me.GridView1.DataBind()
        ViewState("dt") = dt
    Else
        Dim dt1 As DataTable = TryCast(ViewState("dt"), DataTable)
        dt1.Rows.Add(id, name, country)
        Me.GridView1.DataSource = dt1
        Me.GridView1.DataBind()
    End If
End Sub

Screenshot